I use headphones in tandem with an android smartphone. And here there is a very important nuance. By default, when connected to a smartphone, the ears used the aac codec. The sound through this codec on my smartphone is very mediocre, spurious harmonics and noise are heard. The problem is solved by switching to SBC hd (there is a topic on 4pda dedicated to the issue of comparing and configuring codecs). That's it with the high-quality sbc codec, the ears play at the cable connection level.
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